乙酰胆碱

acetylcholine ACh (amine related to vitamin B complex)

second of the ten Heavenly Stems 十天干[shi2 tian1 gan1] / second in order / letter "B" or Roman "II" in list "A, B, C", or "I, II, III" etc / second party (in legal contract, usually 乙方[yi3 fang1], as opposed to 甲方[jia3 fang1]) / ethyl / bent / winding / radical in Chinese characters (Kangxi radical 5) / ancient Chinese compass point: 105°

turning stroke (in Chinese characters) / see also 折[zhe2]

turning stroke (in Chinese characters), aka 折[zhe2]

acetyl (chemistry)

acid radical / -acyl (chemistry)

gall bladder / courage / guts / gall / inner container (e.g. bladder of a football, inner container of a thermos)

choline (amine related to vitamin B complex)

variant of 鹼|碱[jian3]

base / alkali / soda (chemistry)